Valuing the quantity and quality of product variety to consumers

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This paper presents a new decomposition of the cost of living into price, variety-quality and variety-quantity components. Variety-quantity reflects the value to consumers of an increase in the number of products, while variety-quality measures the average attractiveness of new versus disappearing products. The decomposition is relevant to calculation of the CPI and understanding firms’ product development practices. Our empirical results, using a large US scanner data set, show that variety-quality change is the most important component of variety improvement. This reduced the cost of living by 1.34 percentage points per annum on average, while variety-quantity lowered it by 0.67 percentage points.

Original languageEnglish
Pages (from-to)2107-2128
Number of pages22
JournalEmpirical Economics
Issue number6
Publication statusPublished - Dec 2019


  • CES
  • Consumer Price Index (CPI)
  • Multilateral indexes
  • New goods
  • Quality change
  • Scanner data

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